Hey there,
I hope the subject covers the question because I'm not sure how to explain the problem in one sentence. I try to explain this as good as I possibly can. The text is in Dutch.
I want to create a new view that shows customers that are only on a specific marketing list, let's call this list DUO. When I apply the below filter the result will be; all Contacts that are connected to the DUO marketing list, but also to other marketing lists.

Like the picture below. The contact is connected to the DUO marketing list, but also to other.

Because of GDPR regulations I want to create a view that shows only the contacts that are connected to the DUO marketing list only. If another marketing list is connected to the contact I don't want to have that contact in the created view. After the view is created we can delete the contacts in bulk.
I'm not strong in javascript of any coding, so is this is possible within the standard that would be nice.
If something is not clear, i'll love to hear that and i'll try to explain this in a different way.
Thank you in advance.